I can see correct options:
$ sudo pulp consumergroup create --help
Usage: pulp -u <username> -p <password> consumergroup create [OPTIONS]
Options:
-h, --help show this help message and exit
--id=ID consumer group id
--description=DESCRIPTION
description of consumer group
--consumerids=CONSUMERIDS
consumer id list to be included in this group
-u USERNAME, --username=USERNAME
<REQUIRED> username for access to Pulp. Default user
admin is included with base install.
-p PASSWORD, --password=PASSWORD
<REQUIRED> password for access to Pulp.
I don't think help in the bug report was consumergroup create help, because it should not have --consumerid=CONSUMERID as an option.